SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 134: Higgs, Di-Higgs IV
T 134.1: Vortrag
Donnerstag, 23. März 2023, 17:30–17:45, HSZ/0105
Differential measurement of the H→ττ cross-section in the VBF production mode — •Lena Herrmann, Christian Grefe, Philip Bechtle, and Klaus Desch — Physikalisches Institut, Universität Bonn
Precision measurements of the Higgs boson properties are promising to show evidence of BSM physics. One aspect of interest is the Yukawa-interaction which can be directly investigated by the cross-section measurement of the di-τ final state. Detailed studies are performed in a combined maximum-likelihood fit of the di-τ mass in different pTH bins using the "Simplified Template Cross Section" framework (STXS). Orthogonal control regions are used to determine and to validate the contribution of important background processes. Multi-jet events which are misidentified as visible τ’s (fakes), play an important role apart from the dominant Z→ ττ events. The fraction of fake events depends on the decay-mode of the hadronically decaying τ and has a less prominent contribution if no neutral pions are involved in the final state. In past analysis efforts, the estimated fake background events were only differentiated by 1- and 3-prong events which is why a more accurate, now decay-mode dependent fake background estimation is developed. It enables a loosened event selection for decay-modes without neutral pions and thus, an increased selection efficiency of signal events.
The method as well as the influence of the improved background estimation on the sensitivity of the measurement in different STXS bins will be discussed.